#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main() {
	int n = 0;
	scanf("%d", &n);
	int i = 0;
	int max = 0;
	for (i = 1; i <= n; i++) {
		int h = 0;
		scanf("%d", &h);
		if (max < h) {
			max = h;
		}
	}
	printf("%d", max);
	return 0;
}